6510/65816 Addressing mode: Zeropage/Direct Indexed -- d,x d,y
(ADC,AND,BIT,CMP,EOR,LAX,LDA,LDX,LDY,NOP,ORA,SAX,SBC,STA,STX,STY,STZ)
(2 bytes) (4,5 and 6 cycles)
+---------------+------------------+-----------------------+----------+
| Cycle | Address Bus | Data Bus |Read/Write|
+---------------+------------------+-----------------------+----------+
| 1 | PBR,PC | Op Code | R |
| 2 | PBR,PC+1 | Direct Offset | R |
| (2) 2a | PBR,PC+1 | Internal Operation | R |
| 3 | PBR,PC+1 | Internal Operation | R |
| 4 | 0,D+DO+I | Data Low | R/W |
| (1) 4a | 0,D+DO+I+1 | Data High | R/W |
+---------------+------------------+-----------------------+----------+
(1) Add 1 cycle for M=0 or X=0 (i.e. 16 bit data).
(2) Add 1 cycle for direct register low (DL) not equal 0.
See also: Abbreviations